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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
The frequency of an allele within the gene pool is an important measure of evolution. Favorable mutations (variant alleles) will increase their frequency in the gene pool, while detrimental mutations will decrease their frequency.